(Node.js) Download a Specific GMail Message into a Chilkat Email Object

Demonstrates how to download a GMail message into a Chilkat Email object.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var success;

    var http = new chilkat.Http();
    http.AuthToken = "GMAIL-ACCESS-TOKEN";

    // The id of the GMail message to download.
    var id = "166e50fed0b9b0cb";
    var userId = "me";

    http.SetUrlVar("userId","me");
    http.SetUrlVar("id",id);

    // Fetch the email.
    var url = "https://www.googleapis.com/gmail/v1/users/{$userId}/messages/{$id}?format=raw";
    var sbJson = new chilkat.StringBuilder();
    success = http.DownloadSb(url,"utf-8",sbJson);
    if (success !== true) {
        console.log(http.LastErrorText);
        return;
    }

    var json = new chilkat.JsonObject();
    json.LoadSb(sbJson);
    json.EmitCompact = false;

    if (http.LastStatus !== 200) {
        console.log(json.Emit());
        console.log("Failed.");
        return;
    }

    // The returned JSON contains something like this:

    // {
    //   "id": "166e50fed0b9b0cb",
    //   "threadId": "166e50fed0b9b0cb",
    //   "labelIds": [
    //     "CATEGORY_SOCIAL",
    //     "INBOX"
    //   ],
    //   "snippet": "...",
    //   "historyId": "582477",
    //   "internalDate": "1541441317000",
    //   "sizeEstimate": 28603,
    //   "raw": "BASE64URL_CONTENT"
    // }

    // The RFC822 MIME of the email is contained in the "raw" as a base64URL encoded string.
    // Let's decode and load into a Chilkat email object..
    var sbRaw = new chilkat.StringBuilder();
    json.StringOfSb("raw",sbRaw);
    sbRaw.Decode("base64url","utf-8");

    var email = new chilkat.Email();
    email.SetFromMimeSb(sbRaw);

    // Now we can use the email API to do whatever we desire..
    console.log("From: " + email.FromAddress);
    console.log("Subject: " + email.Subject);
    // ...

}

chilkatExample();